Flow box for paper machines



April 21, 1925. 1,534,080

. A. N. RUSSELL I -FLOW BOX FOR PAPER MACHINES Filed June 50, 1923INVENTOR ANDPEWNPUSSELL ATTORN S V levers.

' and to split up the Patented Apr. 21, 1925?.

UNITE T ES L ANDREW N. RUSSELL, 0F LACHINE, QUEBEC, CANADA.

FLOW BOX FOR PAPER MACHINES.

Application filed June 30, 1923. Serial No. 648,786.

and the object of the invention is to provide a device which willdeliver the stock mixture on to the travelling wire at the same velocityas that of the travelling wire.

Another object'is to provide a device which will deliver the stockmixture on to thetravelling wire with the fibre of stock properlydistributed and mixed to form a strong sheet.

A further object is to provide a simple device which will be readilyadjustable to suit the stock mixture and feed of same.

Nozzle arrangements have been used for delivering the stock on to thetravelling wire, but as far as I am aware, means have not been providedto prevent the fibres in the pulp from assuming stream lines, efi'ect ofwhich is to materially weaken the sheet of paper in one direction' In myinvention I provide a deflecting member, which extends across from sideto side of the flow box and is supported by levers at each end, which inturn are pivotally mounted to allow the member to be adjusted in thevertical plane. The deflecting member is pivotally mounted on thesupporting A second lever is secured to one end of the cross members totransmit to it a rotary movement. The deflecting member is so positionedand formed as to provide noz- 'zles between the sides and bottom of theflow box. The effect of the several movements of the deflecting memberis to pro- .duce a variation in the shape of the nozzles stream of stockinto two streams, one of which flows under said member and the otherover member. The two streams, meet, produce a disturbance in the stockmixture and therefore a disturbance in the fibres of that mixture. Afinal nozzle is the the top of the. when they provided for deliveringthe stock to the travelling wire. Rods are connected to the levers foroperating same.

In the drawings which illustrate the in- I vention Figure 1 is a crosssectional elevation of a flow box, showing the arrangement of thedeflecting member and its operating mechamsm.

Figure 2 is an enlarged view of the deflecting member, showing theoperating levers.

Referring more particularly to the drawings, 11 designates a flow boxwith bafiles 11 and with the flow of the pulp indicated by arrows; Thebox is provided with a diverging nozzle 12, which delivers the'pulp to atravelling wire 18. The delivery nozzle can be adjusted by means of theadjusting screw 14; and the handle 15 which is'positioned at thedelivery end of the flow box. To prevent the fibre in the pulp fromassuming stream lines, a diverting member 16 is placed within the feedbox adjacent the delivery end thereof. The diverting member is providedwith flat surfaces 17 and 18, so constructed as to form a verticalnozzle between the floor box sides'19 and the fiat surface 17 and ahorizontal nozzle between the bottom of the flow box 20 and the flatsurface 18. The other sides of the diverting member may be curved, asshown, or any other desired shape. The member 16 is pivotally mountedonthe levers 21, which .in turn are mounted on the pivots 22 at eachside of the flow box. This will allow vertical adjustment of the deviceto regulate the flow of the mixture under the member. A turninglever 23is secured to one end of the member 16 and is so arranged as to impartrotary, movement to the member. Connecting rods 24: and 25 are. attachedto the ends of the levers 21 and 23 respectively and to a control pointoutside the flow box.

The operation of the device is as follows:

Pulp is delivered into the flow box and flows in the direction indicatedby the" arrows in Figure 1. The diverting member which extends acrossthe flow box, forms a vertical nozzle with the front of the box and ahorizontal nozzle with the bottom of the box. The flow of pulp is brokeninto two streams, one passing under the diverting .to the travellingwire. The through this nozzle is slightly retarded in member andattaining its maximum velocity at a point directly under the centre ofthe said member. This horizontal stream after passing the centre issomewhat reduced in velocity and at its point of least velocity it ismet and penetrated by the stream coming over the top, through thevertical nozzle. The eflect produced by these two streams comingtogether is to create a disturbance in the stock and therefore adisturbance of the fibres in that mixture. It also retards the flow 'ofthe horizontal stream to allow the proper mixing of the fibres of thestock,

' which knit and cross one another during this 15 The mixed stockdiverging nozzle stock in passing retardation of the flow. then passesthrough a final order that the pulp fibres will remain in their mixedcondition. This final. nozzle can be adjusted to deliver the mixed.streams to-the travelling wire at a velocity approximately the same asthe wire. The flow of the two streams of stock is controlled by thevarious adjustments which as to the position and shape of the verticaland horizontal nozzles formed by the divertin member. This member beingoscillatabIy mounted on pivoted levers 21 can be adjusted vertically bymoving said pivoted levers through the medium of the connecting rods 24,and it also can be rotated aboutits own axis through the levers 23operated by the connecting rod 25, thusigivingan almost unlimited numberof adjustments. 7

In the foregoing part of this specification I have described mypreferred embodiment of the invention,. but I do not wish to confine thedesign of the diverting member to any particular construction. Thismember may consist of a substantially fiat sheet extending across theflow box, thus breaking the flow into two streams and brin ing thestreams together again to thoroug ily mix the fibres in the stock.Adjusting means can also be fitted to the sheet to adjust the flow ofthe streams to give the desired result. In this specification I includeall construction of diverting means which split the flow of stock into aplurality of streams of different angles and bring thestreams togethercan be made again, said means being adjacent the deliver endo-f the flowbox.

aving thus described my invention, what I claim is 1. In a flow box forpaper making machines, means for diverting the flow of the pulp into twostreams, means for rotatably adjusting the diverting means, means forimparting vertical movement to the diverting means, means'to bring thestreams together, and adjustable means to control the flow of themixture to a travelling wire.

2. In a flow box for paper making machines, an adjustable divergingdelivery nozzle', means for diverting the flow of the pulp into aplurality of streams of different direction, said means being adjacentthe delivery nozzle, and means for controlling and mixing the fibrousmaterial in said streams.

3. In a flow box for paper making machines, an adjustable nozzle fordelivering pulp to a screen, a diverting member for temporarily breakingthe flow of pulp into two streams of different directions, means forimparting rotary movement to the diverting member, means for impartinvertical movement to the; diverting mem er, and means for bringing thestreams together at a point adjacent the delivery nozzle.

4. Iii a flow box for paper making machines, an adjustable deliverynozzle, a diverting member adjacent the delivery nozzle and within theflow box, adapted to break the How of the pulp into vertical andhorizontal streams, means secured to the diverte ing member to formdivergingv ertical and horizontal nozzles with the sides and bottom ofthe box respectively and adjacent the delivery nozzle, and means tocontrol the said vertical and horizontal nozzles.

5. In a flow box, box adjacent the delivery nozzle and provided withangularly related faces cooperating with opposing portions of the box toprovide intersecting vertical and horizontal nozzles through which thepulp is caused to flow in separate streams meeting at the intersectionof the nozzles.

In witness whereof, I have hereunto set my hand.

' ANDREW N. RUSSELL.

9, member crossing the

